Dress Cotton Sleeve Front Womens Short Short Decoraapparel Wax P16 Stylish Dress 2 Red 0xYzY
Long Standard Sleeve Womens Beaded Midnight Papell Dress Adrianna Cap Sleeve Standard Cap Adrianna Long Midnight Womens Dress Papell Beaded

Papell Cap Long Dress Sleeve Womens Beaded Adrianna Midnight Standard HAqBwTB7

A constructor parameter decorator that marks a dependency as optional.

See also

Description

The DI framework provides null if the dependency is not found. For example, the following code allows the possibility of a null result:

class Engine {} @ Injectable() class Car { constructor(@ Optional() public engine: Engine) {} } const injector = ReflectiveInjector.resolveAndCreate([Car]); expect(injector.get(Car).engine).toBeNull();
      
      class Engine {}

@Injectable()
class Car {
  constructor(@Optional() public engine: Engine) {}
}

const injector = ReflectiveInjector.resolveAndCreate([Car]);
expect(injector.get(Car).engine).toBeNull();
    

Options